Am I using the right settings and correction files for PPP? I’m trying to get the precise position of my roof antenna to use for an RTK base station once my Navio arrives. It’s running but my outputs seem to be all over, while others are reporting accuracies within 10cm - do I just need to wait for today’s correction data and run it again tomorrow with an additional 24hrs of data?
You need to use sp3 file for precise ephemeris, they are available for download here:
http://igscb.jpl.nasa.gov/components/prods_cb.html
I have the sp3 files, as well as clk and 15i files. I’m going to run it again with ~36 hours data later today after the correction files are out.
Are my other settings ok? (Filter Type/Elevation Mask/Earth Tides/Troposphere/check boxes) I found topex files as well which I assume are for troposphere correction, but it seems RTKLIB doesn’t support them.
Combined filter should give you better results. Other options look okay (Personally I never noticed much difference with Earth Tides correction on.)
Thanks, it seems to be working better with more data. But now I’m running into insufficient memory errors (shouldn’t be possible, it’s on a machine with 128GB ram). Is there a 64-bit build available anywhere?
Probably not. You can try to specify smaller period.
If receiver is dual frequency set iono correction to iono free l1l2, set tropo to est ztd + grad, if observation period is less than 24 hours use earth tides corrections. For best results also download , dcb, pcv, and atx files using rtkget.
If using .atx files, be sure to apply same file as antenna and receiver.
is there any atx specificatiosn fro Tallysman antennas?
Hi @mikhail.avkhimenia, how to choose the right sp3 file, example my rinex from reach is rov_201609160955, it’s mean 16-09-2016 09:55, so which sp3 should i download? And do we need just sp3 file? And what other files needed to increase accuracy? Thank you
These are from that site at 16-09-2016
[ ] igu19145_06.erp.Z 16-Sep-2016 02:15 464
[ ] igu19145_06.sp3.Z 16-Sep-2016 02:15 183K
[ ] igu19145_06.sum.Z 16-Sep-2016 02:15 5.4K
[ ] igu19145_12.erp.Z 16-Sep-2016 08:15 460
[ ] igu19145_12.sp3.Z 16-Sep-2016 08:15 179K
[ ] igu19145_12.sum.Z 16-Sep-2016 08:15 5.4K
[ ] igr19144.clk.Z 16-Sep-2016 10:15 577K
[ ] igr19144.cls.Z 16-Sep-2016 10:15 7.0K
[ ] igr19144.erp.Z 16-Sep-2016 10:15 390
[ ] igr19144.sp3.Z 16-Sep-2016 10:15 94K
[ ] igr19144.sum.Z 16-Sep-2016 10:15 6.2K
[ ] igu19144_00_cmp.sum.Z 16-Sep-2016 10:15 3.7K
[ ] igu19144_06_cmp.sum.Z 16-Sep-2016 10:15 3.7K
[ ] igu19144_12_cmp.sum.Z 16-Sep-2016 10:15 3.9K
[ ] igu19144_18_cmp.sum.Z 16-Sep-2016 10:15 3.7K
[ ] igu19145_18.erp.Z 16-Sep-2016 14:15 465
[ ] igu19145_18.sp3.Z 16-Sep-2016 14:15 174K
[ ] igu19145_18.sum.Z 16-Sep-2016 14:15 5.6K
[ ] igu19146_00.erp.Z 16-Sep-2016 20:15 460
[ ] igu19146_00.sp3.Z 16-Sep-2016 20:15 173K
[ ] igu19146_00.sum.Z 16-Sep-2016 20:15 5.6K
This page has files sorted by days an explanation of different types of ephemeris available:
https://igscb.jpl.nasa.gov/components/prods_cb.html
There are three of them: Final, Rapid, UltraRapid.
Final ephemeris are preferred, download them if they are available.
As a general rule pick the file with the latest time of creation specified.
Thank you @mikhail.avkhimenia. But now I’m trying PPP using post processing online in this site http://www.ga.gov.au/bin/gps.pl and Precise Point Positioning
But both of them reply error in my rinex file, though I already converting files to RINEX 2.11 using RTK-conv. have you ever tried PPP online post processing like this, and if you are willing to share it?
Thank you
These services usually require L1/L2 to work, that may be a reason of an error.
Thank you @mikhail.avkhimenia for the answer. I hope one day later someone provide PPP Post processing for L1.
I contacted the CSRS on this, their reply:
Yes, CSRS-PPP does support single frequency processing, but only uses the code (C1), and not the phase.
The results are highly dependent on the quality of your antenna, as it affects the quality of your solution. You should test your equipment on a known point to determine the best observation period.
So this will not get you centimeter accuracies to my understanding, as it is code only. I got results from them, but they were quite a bit off.
